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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575c0566a2d2a6a050e0507fbee2a7040d1421c79e2b3142ad6481c87b4a143f' 
  AND token = 'Cy19+RIwTY7FiDzEiUWCVmltBnrg/dxV7Q9hAWzbBIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}