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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b55502ac9826d2dbffc5c652806a51a72be6de70bc75c298e4e44336527585' 
  AND token = 'HE7nnF7NGP5EzEMEhOnRvJOhehWD5v4DxqFOUDbqGHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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