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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8ab6daae62a99631a0fee74dec500c5977617f0a38304fc4831c3665ecab36' 
  AND token = 'FrhtQntg9IToVokf93HZ3UD5w+hEaBHOciHkevnYwoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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