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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4dba2944b41d3d58e2d0bd12c02f82bb42b00ef75ca134da115a4a792346de0' 
  AND token = '7EWVJ3icSunAu+2scWciNyli6T5KIfFrqxU+yWpz+jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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