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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b36da089ba418950e2660b3ca08aa8035906f653a0fcc2f7e68542d62c16a4' 
  AND token = 'mzQc62XDYq3KU+0y+F82xhSXQXANonANoNlCqLjF0gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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