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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5394b8513dfb7b6ec808b4101ed864dba3ff293427ac372d9cd6cbc911c1089' 
  AND token = 'mfqEbgVgA4GgtulB2t2Y05X5YDxm9yvyl3mltFYwzrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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