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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfee51c78d9e3fe0575908a00d87779c6d373c443f584b7a656d394941578de1' 
  AND token = '13es+4L4QmscfmnKvqy5gUZqwhUPugmR3DU2SS5NdCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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