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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c8f4ef8dfbaa6314fbbb9ba8b71d2d6bb2bc101f84bf18ca2c29321f1cffa8' 
  AND token = 'lms/mLkRIJ2BzYueawqyz3REg3/ZkrBvEDLc/siNBpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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