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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efec1c1995cbb89c08579d0c74e9931b2b3b38f581c406a290e4ac36edf41a3' 
  AND token = 'B6P4Kb8epYcXzKbNorqIJ594Lk5Kvm2ue8w3hqNnsr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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