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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5b8c604fc30461c64cc2ac7d61a2476e570732dec041d1de61895e04d2a6e8' 
  AND token = 'hx4d6Qw8WBF4sf5ibusKOgiApMF/fP/ovjEo7GgPwcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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