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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc978ae9e784716a36e19be12dbdf68ba5ba6f8fbea7c5ae14f3f9758e5a4cf2' 
  AND token = 'zfrQ54pRDkIXqd3qvAqni/xaSiK1iCjgz4vIzSgeFjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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