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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60142114922c7049980d7a8ccd4db6c204b0dc1e317da95ff1ae6f0396ddbf72' 
  AND token = 'ZMJMUmSr3Dld4dNBhrL3Ed30NqBvtKuanfKOU+JklzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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