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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa1e3d1ca37c26514f88fc631b53d72d3509798e74609224c555886e5c3e095' 
  AND token = 'k2i2BL4KSDiGLF91iLFOTjwaoISR/eYm7rkHFXzsMy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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