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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c0add8629d6dfc2deea93e3fae068c13ae92d7afa48de0c50025f6b8b1b9db' 
  AND token = 'sn2qu29Efh9WBXxA/AocMK1Q4OlUc6Q8KwKAqqpJ7oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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