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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7899460cfc143955339388dc97ecf50aa9635b8dc8f68ba24bba0de1a1c23e6a' 
  AND token = 'NmzRttEMeVFHa5MRWhJajvgqgDI16X/jZXaDLAISfg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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