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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3765607948b4cd65f15d53f5e0b33e17c1ebca20a8bbff8eff268f48a81d1e' 
  AND token = 'jz0YLS9bbY1hbSAdn0AAMsCLrYJa+Qqk6o833NAZNSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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