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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1b533ee6cc8f77cd4c4c88494e2483b596ad09a5c3fdaf4365d674b2896ec9' 
  AND token = 'orKchoQATnZPFSIuCJrs/CUuM2maw3pgAoUKn45sCSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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