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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0156a66c0b61a2f438c500a540e31d31d13d8cb0875247420c16f815d004ae76' 
  AND token = 'Ny5qj1EEjcOHm/plECg4IpDi6gdfr7jNCCdb/GcOgDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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