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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df82d397e559c36679230a3de2e231ffb8823f1e7db3cb100089a756c7cdd0f1' 
  AND token = 'dcdq1OPinHV//dSssU6+2uBE4IVXa2gZ2Kzrv6WmbVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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