SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceab9bbe1ee77769bfa97985183a33886220c305fd481c6a52efe7e38b763545' 
  AND token = 'uujIhjvLJhpHSnx+NTN020H6LYMdOaKiZG0Lm4R+4Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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