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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b451427804ea26e5c8edfba3eb7ea0bb73a8c5715515a6802422997df83b1e7' 
  AND token = 'thrYIefsfBNs70wipEZfMh3X2wZ0kouWsJwI2DfUmoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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