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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56505781c22ebfae13aa7400c23fef491c5f31d825d8d5e19dc0c6571f7c2b3' 
  AND token = 'DlEcVevVTdiqHNI/qKnXksOUAlBHefsX10ZyRWioHE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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