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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8d2fea16a64465e7e04df737923ffbf1f590c533bdc98de89d0bbf8a1531c3' 
  AND token = 'meygKT/9S4ogiMsg7YMTvHdIsR1q/DTqySct9kXrg/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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