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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c8c4002dc46f36c633bd4ffef5e9e91614523387674b2f2b7bc9dc220f8e38' 
  AND token = '+xvp5KIz+cOEWK4u1Kv5d3ttYJ7JC1ydbJphskHd0hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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