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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d3318dba3b93cf28a484a4beaef298e1e17650b35d1048517971b13e7a3ecb' 
  AND token = 'McF8ghNH+hM2QD8XrsaQ1Ub1w5t0sw2IiKzukKvGK2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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