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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10dc9e3ef3d5700762d5bb5c496c40ec187d7bde4817c2c305cbab502b042a7' 
  AND token = 'TN9FAOFXPgcqrynFEObRExt5uaBRCdvBmGX9iinX9fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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