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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cca940cd565033157e10c22e3be3b59d3425aa0fc65c193bd6579b72e9059b1' 
  AND token = 'kIMwAa8wdQq+Qc6Q+NQG5sNYUKtNZMky9LOPb3pszXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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