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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18803020670a3f2f2f83720114cb1756e524c6bda7aa4ab7ed951fac081de0b' 
  AND token = 'WdU4HQVfuIYednGmBhlDO5fWLMjuG5DL3Ak61RWPS5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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