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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694faa690f51358dec288bd03fe565629f400d16bba551eda9d7236776593c76' 
  AND token = 'tPmk/Su3IG3/VBILYg9I8oBBT1rBX1nnNWfXeg+hNxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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