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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015c867aee5078733eee58e6eb99ffa890d4ca6ee99448f4f3cbe5e090838798' 
  AND token = '5sAW+Amf1uNwzQASnaZzcPNjZ7i55lBkBC9ZYTygVhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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