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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3ecd536acb27a77878e5a7cc3e5f9277631e86ba82a0f0be7847f70c9789d6' 
  AND token = 'RiLOLVSOaHqCTmmRzcUlTLUogi7NexdKL6UdK46o35Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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