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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0db2dade1849e9ca649210492c0e4b19acf84421b14307dc3aa17a71a528029' 
  AND token = 'i0ktEe5pkSVmhyKb5kGPKUwVuO2Ds3o2D/2HYQgv8ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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