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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b2430c3fa51ba32ed985886b33fa293eab123e58fccbb71526b2f1e2640e42' 
  AND token = 'Xm8H9wMm3pL/IZG4npFU84fVX9TyI+ohyFpNHStYVO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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