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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eb61baf4e8f2677614f814551ea8470b2f902f9a217e3ae93994a2ca4a44eb' 
  AND token = 'Qf6nrR1aO6/zTbAGo+aDcSCCWLJn9tVRYESU3McFhlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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