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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208cbc360356d395344716792fb319b9d4bb693f15d8f69df29236a6f25729b0' 
  AND token = '+mk7uhykJWoQrF0ybUyMM6RS8xXP/hv35Js+g4ELNiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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