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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9774d2400e7d64ceedd4ce4894f5ac7e4e044f91ef9adede0237a8123df1e736' 
  AND token = 'z36EswV3AK/oa1ySi8bA14hmzDIKN3w/dLGWnQS2D5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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