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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef08b04649ba84088211798570bac6a833ce3a67c5a9fc7bba832ca5e41d7829' 
  AND token = 'aR5EMc6mFOQBqkcRre6+ykktJkVRaklYLdd6SF3If90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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