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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf604b8a4d367ef3d97b5a7956ff94f0941258dbb2a13310ba1037dbe551aa39' 
  AND token = 'MgiZKdeNsTPBC13kvXkBqUsQinXN9IeNS4M2dJTI+r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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